PSYB30H3 Lecture Notes - Lecture 6: Berkeley, California, Twin Study, Equivalence Class
Document Summary
Do individual differences in some attribute predict individual differences in that same attribute at some later point in time? (x1 x2) Consistency of individual differences- i. e. relative position or rank order- within a population of individuals over time. Differential continuity is independent if normative changes in trait levels. Freud by age 5 or 6 personality is set. James by age 30 personality is set like plaster (time to grow and change) Meta-analyzed findings (averaging technique) from 152 longitudinal studies involving a total of 3,217 consistency coefficients and 50,207 participants. Consistency increased as a function of age (the older you are the more stable you are). Holding time interval constant at 6. 7 years consistency coefficients equaled: Consistency decreased as a function of that time interval (more time you let pass the more evidence/change you will see). Holding age constant at 20 years, consistency coefficients equaled:
